428947 has 8 divisors (see below), whose sum is σ = 450432. Its totient is φ = 408000.

The previous prime is 428899. The next prime is 428951. The reversal of 428947 is 749824.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3063 + ... + 3199.

It is an arithmetic number, because the mean of its divisors is an integer number (56304).

2⁴²⁸⁹⁴⁷ is an apocalyptic number.

428947 is a deficient number, since it is larger than the sum of its proper divisors (21485).

428947 is a wasteful number, since it uses less digits than its factorization.

428947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269.

The product of its digits is 16128, while the sum is 34.

The square root of 428947 is about 654.9404553087. The cubic root of 428947 is about 75.4167613252.

The spelling of 428947 in words is "four hundred twenty-eight thousand, nine hundred forty-seven".